Talvez deva tentar algumas variações de ortografia:
levels another » reveals another (Expandir a Pesquisa), levels after (Expandir a Pesquisa), levels alter (Expandir a Pesquisa)
developed them » developed thyme (Expandir a Pesquisa), develop them (Expandir a Pesquisa), developed teen (Expandir a Pesquisa)
dosage levels » dose levels (Expandir a Pesquisa), damage levels (Expandir a Pesquisa), message levels (Expandir a Pesquisa)
do developed » d3 developed (Expandir a Pesquisa), who developed (Expandir a Pesquisa), two developed (Expandir a Pesquisa)
level rather » levels rather (Expandir a Pesquisa), level rate (Expandir a Pesquisa), level catheter (Expandir a Pesquisa)
doses level » dose level (Expandir a Pesquisa), does level (Expandir a Pesquisa), dose levels (Expandir a Pesquisa)
drug doses » drug dose (Expandir a Pesquisa), drug disease (Expandir a Pesquisa)
drugs do » drugs _ (Expandir a Pesquisa), drugs a (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( drugs do developed them ) OR ((( drug doses level rather ) OR ( drug dosage levels another ))))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( drugs do developed them ) or ((( drug doses level rather ) or ( drug dosage levels another ))))*.